Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Marc M Sadowsky, M.D.

Psychiatry Physician in Lawrence, MA · enumerated 2005 · practices at Homefront Merrimack, LLC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1558358689

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Registry record

Entity type Individual (Type 1)

Name Dr. Marc M Sadowsky

Credential M.D.

Sex Male

Practice address 354 Merrimack St, Lawrence, MA, 01843

Phone (978) 687-2321

Fax (978) 685-7265

Enumeration date Oct 4, 2005

Last updated in NPPES Mar 4, 2020

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 8176 (NH) Secondary

2084P0805X Geriatric Psychiatry Physician Allopathic & Osteopathic Physicians · License 75226 (MA) Secondary

2084P0805X Geriatric Psychiatry Physician Allopathic & Osteopathic Physicians · License 8176 (NH) Secondary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 75226 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
0106679Y0NH01	Other	NH	ANTHEM
J12074	Other	MA	BCBS
079478000	Other	MA	MAGELLAN FOR BCBSMA
101854	Other	MA	MAGELLAN BEHAVIORAL HEALT
1169401	Other	MA	FIRST HEALTH
99620	Other	MA	CIGNA BEHAVIORAL HEALTH
015769	Other	MA	VALUEOPTIONS FOR OPTIONS
15-90547	Other	MA	UNITED BEHAVIORAL HEALTH
30003553	Medicaid	NH	-
4274226	Other	MA	MAGELLAN FOR AETNA MBRS
68499	Other	MA	VALUE BEHAVIORAL HEALTH
S017593	Other	MA	CHAMPUS
000834	Other	MA	VALUEOPTIONS FOR HPHC
075226	Other	MA	THP

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A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Marc Sadowsky?

Marc Sadowsky is registered in NPPES with the primary taxonomy of Psychiatry Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-03-04.